1.2.1

Fixed all shellcheck warnings from a run of shellcheck 0.7.2.

1.2.0

Fixed installations failing if one or more users don't have Steam installed
Fixed installations failing if the primary group of a user is not the same as that user's name (patch by @jcstryker, thanks!)
Show error messages if required parameters are missing

1.1.1

Complain if a skin that does not exist is supposed to be installed

1.1.0

Changed global directory to /usr/share/steam/skins

1.0.1

Included a README

1.0.0

Initial release